The choanae (sg.: choana), posterior nasal apertures or internal nostrils are two openings found at the back of the nasal passage between the nasal cavity and the pharynx, in humans and other mammals (as well as crocodilians and most skinks).

2024年3月13日 · The choanae are oval-shaped openings that lie between the nasal cavity and the nasopharynx. The choanae are rigid openings that are completely surrounded by bone. They serve as an outflow from the nasopharynx into the mouth and throat. Inferiorly, the choanae are bound by the posterior edge of the horizontal plate of the palatine bone.

2018年1月25日 · A choana (plural: choanae) is one of the two apertures at the back of the nasal cavity that opens into the nasopharynx, the open space behind the nasal cavity in the airways [1]. It is also known as the posterior nasal aperture, and the internal or …

The Choanae are the posterior nasal aperture, separated by the vomer. It is the opening between the nasal cavity and the nasopharynx. It is therefore not a structure but a space bounded as follows: anteriorly and inferiorly by the horizontal plate of palatine bone, superiorly and posteriorly by the sphenoid bone; laterally by the medial ...

choana，英语单词，主要用作名词，作名词时译为“后鼻孔；漏斗”。

2025年1月17日 · Choana, also known as the posterior nasal aperture, is a small opening located at the back of the nasal cavity. It serves as a passageway for air to travel between the nasal cavity and the pharynx, which is the cavity located behind the nasal cavity and above the larynx.

The Choanae are the posterior nasal aperture, separated by the vomer.It is the opening between the nasal cavity and the nasopharynx.It is therefore not a structure but a space bounded as follows: anteriorly and inferiorly by the horizontal plate of palatine bone, superiorly and posteriorly by the sphenoid bone laterally by the medial pterygoi...

本病为鼻后孔闭塞，使鼻与咽部不能贯通，是较为常见的先天性畸形，有单侧性或双侧性、完全性或不完全性闭锁。 病变多为膜性，少数为骨性或混合性。 本病常易与其他先天畸形同时出现。 双侧性闭锁者于出生后多有明显症状；由于新生儿不会张口呼吸而呼吸困难，严重青紫，甚至窒息死亡。 部分患儿如能张口呼吸，每当吮乳和吞咽时，即出现呼吸困难、青紫。 患儿张口呼吸及啼哭时，使上述症状缓解。 单侧性鼻后孔闭锁以右侧为多，多无症状，但患上呼吸道感染时，患 …

Choanae （ SG ： Choana ），后鼻孔或内部鼻孔是在鼻腔和咽部之间的鼻腔后部发现的两个开口，在人类和其他哺乳动物中（以及鳄鱼和大多数Skinks ）。 它们被认为是四畸形的最重要的突触形态之一，它使从水到达了陆地。

2004年11月4日 · The choana, a unique ‘internal nostril’ opening from the nasal sac into the roof of the mouth, is a key part of the tetrapod (land vertebrate) respiratory system.